Praxis Medical Insights

Est. 2024 • Clinical Guidelines Distilled

Made possible by volunteer editors from the University of Calgary & University of Alberta

Last Updated: 9/18/2025

Influenza Vaccine Recommendations for Adults

Age-Based Recommendations

  • The Advisory Committee on Immunization Practices (ACIP) recommends preferential use of higher-dose or adjuvanted influenza vaccines for adults 65 years and older 2
  • Fluzone High-Dose (HD-IIV4) is specifically licensed only for adults aged 65 years and older 1, 2
  • For adults under 65 years of age, standard-dose influenza vaccines are recommended 1
  • The high-dose influenza vaccine contains a higher amount of hemagglutinin per vaccine virus compared to standard-dose vaccines 3, 2

Evidence Supporting Age-Based Recommendations

  • Fluzone High-Dose met prespecified criteria for superior efficacy compared to standard-dose influenza vaccine in a randomized trial conducted among persons aged 65 years and older 4
  • The Centers for Disease Control and Prevention (CDC) does not recommend high-dose influenza vaccine for adults under 65 years 1

Special Circumstances for High-Dose Vaccine in Younger Adults

  • Patients with certain medical conditions aged 18-64 years who are taking immunosuppressive medication may benefit from high-dose influenza vaccines 1, 2
  • Certain transplant recipients aged 18-64 years who are receiving immunosuppressive medications may also benefit from high-dose vaccines 1, 2

Practical Approach to Vaccine Selection

  • For a patient who has just turned 65, Fluzone High-Dose is appropriate and recommended 4, 3, 2
  • For patients under 65 without specific risk factors, standard-dose influenza vaccine should be used 1
  • Vaccination should not be delayed if only standard-dose vaccine is available, as any influenza vaccine is preferred over no vaccination 2

Common Pitfalls and Caveats

  • Administering high-dose vaccine to patients under 65 without specific medical indications is not FDA-approved and may not be covered by insurance 1, 2
  • Shared decision-making about vaccine choice should only occur within the context of FDA-approved indications and ACIP recommendations 4, 3, 1